Temperature sensor assembly

Abstract

A temperature sensor assembly has an explosion proof termination head body having a cap end, a conduit side and a process end, a conduit connection on the conduit side, a cap threaded onto the cap end; and a terminal block attached to the termination head body with a probe extending from the terminal block through a close tolerance opening in the process end. A terminal block is spring fastened to the termination head body to permit the probe limited axial movement within the close tolerance opening. The process end has a threaded opening in the termination head body, a fitting threaded into the threaded opening in the termination head body; and the close tolerance opening passes through the fitting.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
       1. A temperature sensor assembly, comprising: an explosion proof termination head body having a cap end, a conduit side and a process end;   a conduit connection on the conduit side;   a cap threaded onto the cap end;   a threaded opening in the process end of the termination head body;   a fitting threaded into the threaded opening in the termination head body; and   a terminal block attached to the fitting inside the termination head body with a probe extending from the terminal block through a close tolerance opening in the fitting to form a flame path in the termination head body.   
     
     
       2. The temperature sensor assembly of claim 1 in which the terminal block is spring fastened to the termination head body to permit the probe limited axial movement within the close tolerance opening. 
     
     
       3. The temperature sensor assembly of claim 2 in which the fitting comprises: a flange having greater diameter than the threaded opening; and   means to fasten the terminal block to the flange.   
     
     
       4. The temperature sensor assembly of claim 2 in which, when the fitting is threaded into the threaded opening, the threaded opening includes a threaded portion that is free to receive a threaded end of an electrical fitting from outside of the termination head body.